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Bridgeport Series I CNC Interface Issues

My son recently purchased a Bridgeport Series I CNC with the BOSS 4.0 operating system. The system works fine using the Operator's Main Control Panel. The system includes a ERS CCA that provides an RS-232 interface. This interface was not functional and troubleshooting revealed that the interface line driver and line receiver chips had been blown (probably caused by inadequate grounding between the CNC and computer). I replaced the defective chips (IC4 and IC9) taking the appropriate precautions for static sensitive devices. After replacement of the chips, I performed continuity testing to verify that all connections were intact and that there were no shorts.
I provided a good ground between the CNC and external computer, and installed the repaired ERS CCA. With power applied, the N,F,S,T, Run, GOTO, Hold, and Wait indicators are illuminated and the machine will not operate at all even from the Operator's Main Control Panel. The machine is locked up and I have been unable to clear this condition using the Restart control or the Reset/Clear switch on the Special Operations Panel. Does anyone know what the indicators mean and/or have any idea what could be wrong? Thanks for your support.
Rick Lindquist

Unfortunately I don't have the background to address your problem, at all.

However, I would suggest you post this also on the "General" section, where it is sure to get more visibility.
Not to say this isn't an appropriate place to post it, but the simple fact is the "General" section gets far more exposure, so it's likely to be seen sooner there.